Convert Inch squared to Millidarcy
Convert Inch squared (in²) to Millidarcy (mD) instantly and accurately.
Conversion Formula
mD = in² × 653708370000
About Inch squared
The square inch (in²) equals (0.0254 m)² = 6.4516 × 10⁻⁴ m² ≈ 6.54 × 10¹¹ D. An imperial area unit included for unit-conversion completeness; it appears in some US oil-country tubular goods and industrial filter-media specifications where flow cross-sections are stated in square inches. 1 in² ≈ 6.452 cm² = 6.4516 × 10⁻⁴ m².
About Millidarcy
The millidarcy (mD) equals 10⁻³ D ≈ 9.869 × 10⁻¹⁶ m², the everyday unit in petroleum reservoir engineering worldwide. Conventional sandstone reservoirs: 1-1 000 mD; carbonate reservoirs: 0.1-100 mD; economic gas recovery typically requires k ≥ 0.1 mD. Permeameter and well-test reports give results in mD. 1 mD = 10⁻³ D = 10³ µD.
Quick Reference Table
| Inch squared (in²) | Millidarcy (mD) |
|---|---|
| 1 in² | 6.537 × 1011 mD |
| 2 in² | 1.307 × 1012 mD |
| 5 in² | 3.269 × 1012 mD |
| 10 in² | 6.537 × 1012 mD |
| 25 in² | 1.634 × 1013 mD |
| 50 in² | 3.269 × 1013 mD |
| 100 in² | 6.537 × 1013 mD |